/*
 * * server.c -- a stream socket server demo
 */

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <netdb.h>


#define MYPORT 4243    /* the port users will be connecting to */

#define BACKLOG 10     /* how many pending connections queue will hold */

#define MAXDATASIZE 200 

int main()
{
  int readNum=0,totalChar=0;
  int sockfd, new_fd;  /* listen on sock_fd, new connection on new_fd */
  struct sockaddr_in my_addr;    /* my address information */
  struct sockaddr_in their_addr; /* connector's address information */
  unsigned int sin_size;
  char their_addr_hr[INET_ADDRSTRLEN];
  char *tamanho_do_buf;
  char buf[MAXDATASIZE];
  int numbytes, yes=1;
  FILE *wsock, *rsock;
  
  if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
    perror("socket");
    exit(1);
  }
  if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1) {
    perror("setsockopt");
    exit(1);
  }
  
  my_addr.sin_family = AF_INET;         /* host byte order */
  my_addr.sin_port = htons(MYPORT);     /* short, network byte order */
  my_addr.sin_addr.s_addr = INADDR_ANY; /* automatically fill with my IP */
  bzero(&(my_addr.sin_zero), 8);        /* zero the rest of the struct */
  
  if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == -1) {
    perror("bind");
    exit(1);
  }
  
  if (listen(sockfd, BACKLOG) == -1) {
    perror("listen");
    exit(1);
  }
  
  
  while(1) {  /* main accept() loop */
    sin_size = sizeof(struct sockaddr_in);
    if ((new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size)) == -1) {
      perror("accept");
      continue;
    }
  
  wsock = fdopen(new_fd,"w+");
  rsock = fdopen(new_fd,"r+");
  
  
    /*
      inet_ntop(AF_INET, &their_addr.sin_addr, their_addr_hr, INET_ADDRSTRLEN);
    printf("server: got connection from %s\n",their_addr_hr);
    if (!fork()) { 
      while ((numbytes=read(new_fd, buf, MAXDATASIZE)) > 0) {
	readNum++;
	totalChar += numbytes;
	if (write(new_fd, buf, numbytes) == -1){
	  perror("write");
	  close(new_fd);
	  exit(1);
	}        
      }
      if(numbytes == -1) {
	perror("read");
	close(new_fd);
	exit(1);
      }
      if(numbytes == 0) {
	fprintf(stderr,"Numero de leituras: %d\nNumero de caracteres lidos: %d\n",readNum,totalChar);
	close(new_fd);
	exit(1);
      }
    }
     */
    
    
    inet_ntop(AF_INET, &their_addr.sin_addr, their_addr_hr, INET_ADDRSTRLEN);
    printf("server: got connection from %s\n",their_addr_hr);
    if (!fork()) { /* this is the child process */
      tamanho_do_buf = fgets(buf,MAXDATASIZE,rsock);
      fflush(rsock);
      if(tamanho_do_buf != NULL){
	numbytes = strlen(tamanho_do_buf);
      } else{
	numbytes = 0;
      }
      while (numbytes > 0) {
	readNum++;
	totalChar += numbytes;
	if ((fputs(buf,wsock)) == EOF){
	  perror("write");
	  close(new_fd);
	  exit(1);
	}
	fflush(wsock);
	tamanho_do_buf = fgets(buf,MAXDATASIZE,rsock);
	fflush(rsock);
	if(tamanho_do_buf != NULL){
	  numbytes = strlen(tamanho_do_buf);
	} else{
	  numbytes = 0;
	  tamanho_do_buf ="a";
	}
      }
      
      if(tamanho_do_buf == NULL) {
	perror("read");
	close(new_fd);
	exit(1);
      }
    
      if(numbytes == 0) {
	fprintf(stderr,"Numero de leituras: %d\nNumero de caracteres lidos: %d\n",readNum,totalChar);
	close(new_fd);
	exit(1);
      }
    }
    close(new_fd);  
    while(waitpid(-1,NULL,WNOHANG) > 0); /* clean up all child processes */
  }
}


